By May, the soil has warmed, the last frost is behind most regions, and garden centers are bursting with possibilities. The plants you choose now will shape what your yard looks like through the entire summer. Plant smart and you can have nonstop color from June through September, with very little upkeep along the way. The key is mixing fast bloomers, long-season performers, and late-summer stars in the right spots.
Warm-Season Annuals That Bloom Until Frost
With frost behind you, May is the time to bring out heat-loving annuals. Zinnias, cosmos, marigolds, vinca, lantana, and petunias all thrive once temperatures climb and continue blooming until the first hard freeze of fall.
Direct-sown zinnias and cosmos can be flowering within 6 to 10 weeks, while transplanted nursery pots give you near-instant color in the bed. For shade or part-shade spots, lean on impatiens, begonias, and coleus instead. The right annual mix planted in May translates to a yard full of blooms by mid-June and continues all the way through September.
Long-Blooming Perennials Worth Their Investment
May is also one of the best months for planting perennials. Their roots have time to establish before the heat of summer, and many will reward you with color year after year. Long-bloomers like coneflower (Echinacea), black-eyed Susan (Rudbeckia), Shasta daisy, salvia, and coreopsis all flower from early summer well into fall.
According to the North Carolina Extension Gardener Plant Toolbox, Rudbeckia fulgida 'Goldsturm' produces a tidy dome of golden blooms for many weeks in late summer and is one of the most reliable choices for the season. Plant perennials in groups of three or five for a fuller, more designed look right away.
Dahlias and Other Summer Bulbs to Plant Now
Summer-flowering bulbs and tubers planted in May reward you with blooms that peak in July and last until frost. According to the University of Georgia Cooperative Extension and The Old Farmer's Almanac, dahlia tubers should go in the ground once soil temperatures reach 60 degrees Fahrenheit and all danger of frost has passed.
Plant tubers about 5 to 6 inches deep with the eye facing up, and stake them right at planting time to avoid damaging the roots later. Lilies, gladiolus, and caladiums also do well planted now and produce showy color through the heart of summer. Stagger gladiolus plantings every two weeks for a longer bloom window.
Heat-Loving Container Plants
For containers on the patio or deck, May is the time to refresh tired pots with summer-loving plants. Sweet potato vine, calibrachoa (often sold as Million Bells), lantana, dragon wing begonias, and angelonia all stand up to heat and bloom continuously with regular feeding.
Pair tall thrillers like canna or ornamental grass with mounding fillers and trailing spillers for the classic container formula. It's also important to refill or top-dress the soil with fresh potting mix each spring, since old soil can become compacted and depleted by the end of last year.
Edibles That Earn Their Spot
Vegetables and herbs are productive in May and can be just as beautiful as ornamentals. Tomatoes, peppers, and eggplant should go in once the soil warms up, ideally on a calm, overcast day. Basil, parsley, and rosemary can be tucked in among ornamentals for color and texture in addition to flavor.
Direct-sow beans, squash, cucumbers, and sunflowers as the soil reaches its warmest. The combination of edibles and ornamentals in the same beds is one of the most rewarding trends in modern home gardening, and a row of cherry tomatoes or basil in front of zinnias is hard to beat.
Vines and Climbers for Vertical Color
Vines add height and movement that flat beds simply can't deliver. Mandevilla, morning glory, sweet pea, black-eyed Susan vine, and clematis all thrive when planted in May. They can climb a trellis, scramble up a fence, or spill over a pergola, and most flowers steadily through summer with minimal care.
Place them somewhere they'll be seen from your favorite outdoor seating area, since vertical color is what makes a yard feel layered and lush. Annual vines like morning glory grow especially fast and can cover a trellis in a single season.
Fragrant Plants That Welcome You In
A fragrant garden is a memorable one. Lavender, dianthus, sweet alyssum, jasmine, gardenia, and night-blooming nicotiana all add a layer of scent that makes the garden feel alive in a way visuals alone can't.
Consider planting them near walkways, doorways, or seating areas where you'll naturally brush past or sit nearby. Many fragrant plants also attract pollinators like bees, butterflies, and hummingbirds, which adds another dimension of life and movement to the garden through summer.
Plan for Late Summer, Not Just June
A common mistake is planting only what's blooming at the garden center in May. June's color is easy. The harder thing is making sure something gorgeous is happening in mid-August, too.
Sedum, aster, ornamental grasses, Russian sage, perennial hibiscus, and Joe Pye weed all peak later in the season and keep the garden looking vibrant when most spring stars have already finished. A good rule is to walk through the garden center once a month all summer to see what's blooming then, since those are exactly the plants worth adding for that future window.
A Garden Built for Months of Color
A May planting day spent thoughtfully sets up a garden that performs all summer long. Mix annuals for instant color, perennials for repeat performances, and a handful of late-season bloomers so the show keeps going through Labor Day.
Remember to water deeply and consistently in the first few weeks while roots establish, mulch generously to lock in moisture, and step back to enjoy what comes next! Few investments of an afternoon pay off as steadily as a smart May planting day, and the rewards keep showing up week after week.